C#：事件还是观察者接口优点缺点

C#：事件还是观察者接口？优点缺点？

csharp
using System;
// 定义事件参数类
public class MyEventArgs : EventArgs
{
    public string Message { get; set; }
}
// 定义发布者类
public class Publisher
{
    // 声明事件
    public event EventHandler MyEvent;
    // 发布事件
    public void PublishEvent(string message)
    {
        // 创建事件参数对象
        MyEventArgs args = new MyEventArgs { Message = message };
        // 触发事件
        OnMyEvent(args);
    }
    // 触发事件的方法
    protected virtual void OnMyEvent(MyEventArgs e)
    {
        MyEvent?.Invoke(this, e);
    }
}
// 定义订阅者类
public class Subscriber
{
    // 订阅事件
    public void Subscribe(Publisher publisher)
    {
        publisher.MyEvent += HandleEvent;
    }
    // 取消订阅事件
    public void Unsubscribe(Publisher publisher)
    {
        publisher.MyEvent -= HandleEvent;
    }
    // 处理事件的方法
    private void HandleEvent(object sender, MyEventArgs e)
    {
        Console.WriteLine($"Subscriber received message: {e.Message}");
    }
}
public class Program
{
    public static void Main(string[] args)
    {
        Publisher publisher = new Publisher();
        Subscriber subscriber1 = new Subscriber();
        Subscriber subscriber2 = new Subscriber();
        // 订阅事件
        subscriber1.Subscribe(publisher);
        subscriber2.Subscribe(publisher);
        // 发布事件
        publisher.PublishEvent("Hello, world!");
        // 取消订阅事件
        subscriber1.Unsubscribe(publisher);
        subscriber2.Unsubscribe(publisher);
        // 发布事件
        publisher.PublishEvent("Goodbye, world!");
        Console.ReadLine();
    }
}